General Korniloff takes Wiktorow, five miles south-west of Halicz; enemy falls back behind the River Lomnica; another 1,000 prisoners. British line advanced on the Messines front east of Oosttaverne. German counter-attack on French front east of Hurtebise repelled. French counter-attack at Braye-en-Laonnois; German gains on a front of nearly a mile won back. Russians report their evacuation of Penjvin, Khanikin, and Kasr-i-Shirin, Mesopotamian front, owing to Turkish pressure. H.M.S. Vanguard blown up as a result of internal explosion; 97 survivors out of a complement of about 800. British armed trawler Iceland destroys two German seaplanes. British airmen over Constantinople; they bomb the Goeben and the War Office. Secret Session of House of Commons on London air raid.